fix: 按下游查询节点控制 LLM 配置显示

- 仅展示可绑定的下游数据查询节点，无候选时隐藏查询数据信息

- 移除模型设置下的冗余模型标签

easyflow-ui-admin/packages/tinyflow-ui/src/components/nodes/LLMNode.svelte

@@ -15,6 +15,7 @@
   import ParamTokenEditor from '../core/ParamTokenEditor.svelte';
   import {
     buildEditorReferenceParameters,
+    collectDownstreamNodeIds,
     FIELD_BINDING_META_KEY,
     syncManagedParametersForFields,
     updateFieldBindingMeta,
@@ -29,6 +30,9 @@
     let currentNode = useNodesData(currentNodeId);
     const { addParameter } = useAddParameter();
     const { nodes, edges } = $derived(useStore());
+    const downstreamNodeIds = $derived.by(() => {
+        return new Set(collectDownstreamNodeIds(currentNodeId, edges || []));
+    });
     const editorParameters = $derived.by(() => {
         const parameters = buildEditorReferenceParameters(
             currentNodeId,
@@ -52,7 +56,9 @@
     });
     const queryContextOptions = $derived.by(() => {
         return (nodes || [])
-            .filter((node: any) => node?.id !== currentNodeId && node?.type === 'search-dataset-node')
+            .filter((node: any) =>
+                downstreamNodeIds.has(node?.id) && node?.type === 'search-dataset-node'
+            )
             .map((node: any) => ({
                 label: node?.data?.title || '查询数据',
                 value: node.id,
@@ -215,6 +221,7 @@
 
     <RefParameterList dataKeyName="images" noneParameterText="无图片参数" />
 
+    {#if queryContextOptions.length > 0}
         <Heading level={3} mt="10px">查询数据信息</Heading>
         <div class="setting-item">
             <Select
@@ -228,9 +235,9 @@
                 value={queryContextNodeIds}
             />
         </div>
+    {/if}
 
     <Heading level={3} mt="10px">模型设置</Heading>
-    <div class="setting-title">模型</div>
     <div class="setting-item">
         <Select items={llmArray} variant="model" style="width: 100%" placeholder="请选择模型" onSelect={(item)=>{
               const newValue = item.value;